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## Copyright (c) 2020 The WebM project authors. All Rights Reserved.
##
## Use of this source code is governed by a BSD-style license
## that can be found in the LICENSE file in the root of the source
## tree. An additional intellectual property rights grant can be found
## in the file PATENTS. All contributing project authors may
## be found in the AUTHORS file in the root of the source tree.
##
# coding: utf-8
import numpy as np
import numpy.linalg as LA
import matplotlib.pyplot as plt
from scipy.ndimage import filters
from PIL import Image, ImageDraw
def MSE(blk1, blk2):
return np.mean(
LA.norm(
np.array(blk1, dtype=np.int) - np.array(blk2, dtype=np.int), axis=2))
def drawMF(img, blk_sz, mf):
img_rgba = img.convert('RGBA')
mf_layer = Image.new(mode='RGBA', size=img_rgba.size, color=(0, 0, 0, 0))
draw = ImageDraw.Draw(mf_layer)
width = img_rgba.size[0]
height = img_rgba.size[1]
num_row = height // blk_sz
num_col = width // blk_sz
for i in xrange(num_row):
left = (0, i * blk_sz)
right = (width, i * blk_sz)
draw.line([left, right], fill=(0, 0, 255, 255))
for j in xrange(num_col):
up = (j * blk_sz, 0)
down = (j * blk_sz, height)
draw.line([up, down], fill=(0, 0, 255, 255))
for i in xrange(num_row):
for j in xrange(num_col):
center = (j * blk_sz + 0.5 * blk_sz, i * blk_sz + 0.5 * blk_sz)
"""mf[i,j][0] is the row shift and mf[i,j][1] is the column shift In PIL coordinates, head[0] is x (column shift) and head[1] is y (row shift)."""
head = (center[0] + mf[i, j][1], center[1] + mf[i, j][0])
draw.line([center, head], fill=(255, 0, 0, 255))
return Image.alpha_composite(img_rgba, mf_layer)
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